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<base href="https://bugs.freedesktop.org/" />
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<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - xlib.fallback occasionally incorrectly treats OVER as SOURCE"
href="https://bugs.freedesktop.org/show_bug.cgi?id=83896">83896</a>
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<th>Assignee</th>
<td>chris@chris-wilson.co.uk
</td>
</tr>
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<th>Summary</th>
<td>xlib.fallback occasionally incorrectly treats OVER as SOURCE
</td>
</tr>
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<th>QA Contact</th>
<td>cairo-bugs@cairographics.org
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
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<th>Reporter</th>
<td>sixtysix@inwind.it
</td>
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<th>Hardware</th>
<td>Other
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Component</th>
<td>xlib backend
</td>
</tr>
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<th>Product</th>
<td>cairo
</td>
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=106329" name="attach_106329" title="quick hack">attachment 106329</a> <a href="attachment.cgi?id=106329&action=edit" title="quick hack">[details]</a></span>
quick hack
the xlib.fallback composer calls a fill_reduces_to_source in
src/cairo.image-compositor.c that simplifies an OVER operator fill
to a SOURCE operator fill whenever the destination is clear.
This means that you have to mark the shm-image-surface as no longer clear
after it is filled as the attached quick hack does.
It fixes
finer-grained-fallbacks
over-above-source
over-around-source
over-between-source
all .xlib.fallback.rgb24</pre>
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